PicoTK is a C GUI toolkit that requires only a minimum of memory resources. - Read more

The most succinct description of the Standard Widget Toolkit component is this: The SWT component is designed to provide efficient, portable access to the user-interface facilities of the operating systems on which it is implemented. The SWT component imp - Read more

SDL_gui is a C library that runs on top of SDL to provide a (slightly) higher level interface. It provides "widgets" in the form of C structures which are allocated via functions calls (much like GTK). - Read more

Open Motif is the publicly licensed version of Motif, the industry standard user interface toolkit for UNIX systems (IEEE 1295) provided on more than 200 hardware and software platforms including HP, IBM, Linux (Red Hat, Mandrake, and SuSE), SGI, and Sun. - Read more

GTK+ is a multi-platform toolkit for creating graphical user interfaces. Offering a complete set of widgets, GTK+ is suitable for projects ranging from small one-off projects to complete application suites - Read more

C++ (with aditional preprocessor) cross platform (including Linux) GUI library. KDE and Opera are written in Qt. It contains also other things, for example threads or sockets, so it is very good to building cross platform applications - Read more

FLTK (pronounced "fulltick") is a cross-platform C++ GUI toolkit for UNIX®/Linux® (X11), Microsoft® Windows®, and MacOS® X. FLTK provides modern GUI functionality without the bloat and supports 3D graphics via OpenGL® and its built-in GLUT emulation - Read more

python-gdkpixbuf is a dynamic object module to access the gdk-pixbuf image loading library from Python. It's integrated with PyGtk. - Read more

MoreQt extends the Qt library, providing a range control on floating-point values instead of integers and associated widgets, a line edit that "waits" for user validation (using a timer, thefocus loss, or Enter-key press), and a units(length, temperatures - Read more

a stripped down version of Qt that has been put together to use as a backend library and provides all the necessary library classes to comfortably develop in a C++ environment - Read more

FXPy is a Python extension module which provides an interface to the FOX cross-platform GUI library. - Read more

python-gtkhtml is a dynamic object module to access the GtkHTML widget from Python. It is intended to integrate well with pygtk, so that all usual GTK features can be used. - Read more

The Python X Library is an object-oriented library for writing XWindows client applications. It supports all of X11R6, as well as resource databases and the ICCCM protocol. - Read more

ClassyTk is an extension of Tk based on the ClassyTcl Object system. It adds a lot of improvements to Tk, ranging from drag and drop support (between Tk apps) and a configuration system to a large set of new widgets and commands. - Read more

Kiwi is an object-oriented framework for developing graphical applications using Python. It has a set of classes that provide a solid application architecture, and a set of high level graphical components. - Read more

MiniGUI is a GPL'd free software project, led by Beijing Feynman Software Co., Ltd.. It aims to provide a fast, stable, lightweight, and cross-platform Graphics - Read more

An engine that reads XML files describing graphical user interfaces layout. - Read more

FOX is a C++ based Toolkit for developing Graphical User Interfaces easily and effectively. It offers a wide, and growing, collection of Controls, and provides state of the art facilities such as drag and drop, selection, as well as OpenGL widgets for 3D - Read more

wxWindows gives you a single, easy-to-use API for writing GUI applications on multiple platforms. Link with the appropriate library for your platform (Windows/Unix/Mac, others coming shortly) and compiler (almost any popular C++ compiler), and your applic - Read more

LessTif is the Hungry Programmers' version of OSF/Motif®. It aims to be source compatible meaning that the same source code should compile with both and work exactly the same! - Read more